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Proceedure for Windows 2000/3:

Install Loopback Adapter:

Start/Settings/Control Panel/Add Remove Hardware

Add Troubleshoot a device/ Next

No, from list/ Next

Network adapters/ Next

from manufacturers box select Microsoft.

from network adapters box select Microsoft Loopback adapter/ Next


Configuration for the Loopback interface:

ip address: VIP

Subnet mask:  *host mask is not allowed in Windows*

gateway: no value

click “Advanced”

add to the “Interface metric” 254

to correct the subnet mask, this change must be made to the registry:


locate and replace the subnet mask value for the loopback interface from to



ifconfig lo0:1 plumb

ifconfig lo0:1 VIP netmask up


BSD or Mac OS X:
ifconfig lo0 aliase VIP netmask -arp up

Posted on Thursday, September 9, 2004 5:55 PM F5 networks | Back to top

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